Top a cappella group Straight No Chaser have landed collaborations with Phil Collins, Rob Thomas and Dolly Parton for an upcoming album.

The trio will join the vocal group on tracks for Under The Influence, which will be released in May (13).

Details of the songs have yet to be released, but one will be a cover of The Jackson 5's I Want You Back, featuring singer/songwriter Sara Bareilles.

Seal and Jason Mraz have also teamed up with the 10-piece vocal group on tracks for the album.